Java Beginner Problems

This repository contains 15 simple Java problems designed to help beginners build logic and improve their programming skills.

Problems

1. Print "Hello, World!"

Problem: Write a Java program that prints "Hello, World!" to the console.

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2. Sum of Two Numbers

Problem: Write a Java program that takes two numbers as input and prints their sum.

Example:

Input: 5, 10  
Output: 15  

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3. Check Even or Odd

Problem: Write a Java program to check whether a number is even or odd.

Example:

Input: 7  
Output: Odd  

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4. Find the Largest Number

Problem: Write a Java program to find the largest number among three given numbers.

Example:

Input: 5, 12, 7  
Output: 12  

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5. Print Numbers from 1 to 10

Problem: Write a Java program to print numbers from 1 to 10 using a loop.

Output:

1 2 3 4 5 6 7 8 9 10  

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6. Calculate Factorial

Problem: Write a Java program to find the factorial of a number.

Example:

Input: 5  
Output: 120  

(Factorial of 5 = 5 × 4 × 3 × 2 × 1 = 120)

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7. Reverse a Number

Problem: Write a Java program to reverse a given number.

Example:

Input: 1234  
Output: 4321  

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8. Check for Prime Number

Problem: Write a Java program to check whether a number is prime or not.

Example:

Input: 7  
Output: Prime  

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9. Print Multiplication Table

Problem: Write a Java program to print the multiplication table of a given number.

Example:

Input: 5  
Output:  
5 x 1 = 5  
5 x 2 = 10  
...  
5 x 10 = 50  

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10. Check if a Number is Palindrome

Problem: Write a Java program to check whether a number is a palindrome.

Example:

Input: 121  
Output: Palindrome  

(A palindrome is a number that reads the same backward as forward.)

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11. Count Digits in a Number

Problem: Write a Java program to count the number of digits in a given number.

Example:

Input: 12345  
Output: 5  

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12. Find Sum of Digits

Problem: Write a Java program to find the sum of digits of a given number.

Example:

Input: 123  
Output: 6  

(Sum = 1 + 2 + 3 = 6)

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13. Swap Two Numbers Without Using a Third Variable

Problem: Write a Java program to swap two numbers without using a third variable.

Example:

Input: a = 5, b = 10  
Output: a = 10, b = 5  

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14. Print Fibonacci Series

Problem: Write a Java program to print the Fibonacci series up to n terms.

Example:

Input: 7  
Output: 0 1 1 2 3 5 8  

(Fibonacci series: Each number is the sum of the two preceding ones.)

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15. Find the Power of a Number

Problem: Write a Java program to calculate the power of a number using a loop.

Example:

Input: 2^3  
Output: 8  

Note : Do not use Chat gpt and other AI tools to solve and complete the task no. 1